Have a classic pizza thrower? Help me settle a debate

short version: Me and a friend are debating how the pizza thrower worked. he insists it uses air pressure to launch discs, I insist it has a little tab that flicks them out

Anyone have a pizza thrower readily avialbale and can take some pics of the inner chamber to see if you can see a flicking tab?

Mines in a box somewhere and we've been debating this for months now